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从“力效”概念延伸出等力效、等功效和等能效原理
当1000克或1公斤铀235全部裂变时所放出的能量相当于2700吨标准煤燃烧时所放出的能量，这说明1公斤铀和2788吨煤的力效、功效和能效相等或两者在热力、热功和热效上没有什么不同
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